JP2001279155A - Polyolefin resin composition for powder coating and powder for powder coating, and powder molding prepared therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin resin composition for powder coating, which uses polypropylene as a base polymer, is hardly colored even if it comes into contact with a colored liquid such as liquid colored foods including curry, ketchup, soybean sauce, sauce, butter, and the like, and is excellent in mechanical strength, elongation, heat resistance, and the like, and also in adhesion and durability, a powder therefor and a powder-coated article coated therewith. SOLUTION: The polyolefin resin composition for powder coating comprises (a) 100 pts.wt. of a random polypropylene, (b) 5-20 pts.wt. of an unsaturated carboxylic acid-modified polypropylene, (c) 5-20 pts.wt. of a polyethylene resin, and (d) 0.01-0.3 pts.wt. of a radical generator per 100 pts.wt. of the random polypropylene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a polyolefin resin composition for powder coating. More specifically, a polyolefin resin composition for powder coating, which is hardly discolored or colored, has excellent mechanical properties, heat resistance, and film elongation, and is suitable as a coating material for pipes, wires, steel sheets, and the like, and a polyolefin resin composition for powder coating TECHNICAL FIELD The present invention relates to a resin powder for powder coating containing a product and a powder molded product thereof.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 1-297174 discloses a method of forming a film having excellent heat resistance by using a resin composition containing 80 to 97% by weight of modified polypropylene and 20 to 3% by weight of ultra low density polyethylene. There is disclosed a powder coating method for metal products that is characterized by the following.

[0003] Japanese Patent Application Laid-Open No. 8-113834 discloses (a)
Ethylene / propylene block copolymer 30 to 60% by weight, (b) unsaturated carboxylic acid-modified polypropylene 20 to
A polyolefin resin composition for powder coating comprising 40% by weight and (c) 10 to 40% by weight of an elastomer is disclosed.

[0004]

[Problems to be solved by the invention] Curry, ketchup,
When a powder-coated metal product is brought into contact with a liquid colored food such as soy sauce, sauce, and butter, the coated film may be colored. The present invention uses polypropylene as a base polymer, and is hardly colored even when it comes into contact with a colored liquid such as a liquid colored food such as curry, ketchup, soy sauce, sauce, and butter, and has excellent mechanical strength, elongation, heat resistance, and the like. Another object of the present invention is to provide a polyolefin resin composition for powder coating excellent in adhesion and durability, a powder thereof, and a powder molded product obtained by coating these powders.

[0005]

According to the present invention, there are provided (a) 100 parts by weight of random polypropylene, (b) 5 to 20 parts by weight of an unsaturated carboxylic acid-modified polypropylene, (c) 5 to 20 parts by weight of a polyethylene resin and (d) ) Radical generator 0.01 to 100 parts by weight of random polypropylene
It relates to a polyolefin resin composition for powder coating obtained from 0.3 parts by weight.

Further, the present invention provides a powder coating polyolefin resin composition having a melt flow rate at 230 ° C. of 2
The present invention relates to the above polyolefin resin composition for powder coating, wherein the composition is 0 to 70 g / 10 minutes.

[0007] The present invention relates to a resin powder for powder coating containing the polyolefin resin composition for powder coating described above.

[0008] The present invention relates to a polyolefin resin composition for powder coating described above and / or a powder molded article coated with the resin powder for powder coating described above.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to (a) 100 parts by weight of random polypropylene, (b) 5 parts by weight of unsaturated polypropylene modified with carboxylic acids, preferably 6 parts by weight, more preferably 8 parts by weight, particularly preferably 10 parts by weight. Parts by weight to 20
Parts by weight, preferably 18 parts by weight, more preferably 16 parts by weight
Parts by weight, particularly preferably 15 parts by weight, (c) 5 parts by weight of polyethylene resin, preferably 6 parts by weight, more preferably 8 parts by weight, particularly preferably 10 to 20 parts by weight, preferably 18 parts by weight. More preferably 16 parts by weight, particularly preferably 15 parts by weight and (d) 0.01 part by weight of radical generator per 100 parts by weight of random polypropylene, further 0.02 parts by weight, especially 0.04 parts by weight.
It is a polyolefin resin composition for powder coating obtained from the range of parts by weight to 0.3 parts by weight, further 0.2 parts by weight, further 0.15 parts by weight, particularly 0.12 parts by weight.

[0010] The melt flow rate of the polyolefin resin composition for powder coating is 20 g / 10 min.
A range of 10 minutes, especially 35 g / 10 minutes to 70 g / 10 minutes, and more preferably 60 g / 10 minutes, especially 50 g / 10 minutes is preferable because of excellent coating properties and handleability.

(A) Random polypropylene 1 of the present invention
00 parts by weight, (b) 5 to 20 parts by weight of an unsaturated carboxylic acid-modified polypropylene, (c) 5 to 20 parts of a polyethylene resin
The polyolefin resin composition for powder coating obtained from 0.01 to 0.3 parts by weight of a radical generator per 100 parts by weight of random polypropylene and (d) random polypropylene is (a)
100 parts by weight of random polypropylene, (b) 5 to 20 parts by weight of an unsaturated carboxylic acid-modified polypropylene, and (c) 5 to 20 parts by weight of a polyethylene resin, (d) radical generator 0.01 to 0 per 100 parts by weight of random polypropylene A polyolefin resin composition obtained by treating with a radical generated from 3 parts by weight, wherein at least one polymer selected from (a) random polypropylene, (b) unsaturated polypropylene modified with unsaturated carboxylic acids and (c) polyethylene resin Is preferably treated with a radical generated from 0.01 to 0.3 parts by weight of a radical generator per 100 parts by weight of (d) random polypropylene, and a polyolefin resin composition obtained by treating (a) 100 parts by weight of random polypropylene and (d) ) La per 100 parts by weight of random polypropylene Polymer component obtained by treating with the radical generated from the local generating agent 0.01 to 0.3 parts by weight, (b) an unsaturated carboxylic acid modified polypropylene 5
A polyolefin resin composition containing 〜20 parts by weight and (c) 5-20 parts by weight of a polyethylene resin is preferred.

(A) Random polypropylene is JIS
A melt flow rate (MFR) of 0.5 measured at a temperature of 230 ° C. and a load of 21.18 N according to K7210;
(G / 10 minutes), 1 (g / 10 minutes), 3
(G / 10 min), especially 5 (g / 10 min) to 20 (g / min).
10 minutes), further 15 (g / 10 minutes), especially 12 (g /
10 minutes). (A) The random polypropylene has an ethylene and / or butene-1 content of 0.1.
% By weight, further 0.5% by weight, further 2% by weight, especially 3%
Use of a propylene / ethylene random copolymer, a propylene / butene-1 random copolymer, a propylene / ethylene / butene-1 random copolymer or the like in an amount of from 40% by weight to 40% by weight, more preferably 35% by weight, especially 20% by weight. Can be done.

As the radical generator, any substance that generates radicals and any substance that generates radicals by heat can be used. Examples of the radical generator include organic peroxides and azo compounds that generate active oxygen and the like. Specific examples of the organic peroxide include dicumyl peroxide, di-t-
Butyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-
3,1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy)
Balalate, benzoyl peroxide, t-butylperoxybenzoate, acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexanoyl peroxide and 2, Examples thereof include 4-dichlorobenzoyl peroxide and m-toluyl peroxide. Examples of the azo compound include azoisobutyronitrile and dimethylazoisobutyronitrile.

The radical generator is mixed as it is with one or more polymers selected from (a) random polypropylene or (a) random polypropylene, (b) unsaturated carboxylic acid-modified polypropylene and (c) polyethylene resin. The radical generator can be used after being dissolved in a small amount of an organic solvent. As the organic solvent used here, any organic solvent that can dissolve the radical generator can be used without particular limitation. Such organic solvents include
Aromatic hydrocarbon solvents such as benzene, toluene and xylene; aliphatic hydrocarbon solvents such as pentane, hexane, heptane, octane, nonane and decane; alicyclic hydrocarbon solvents such as cyclohexane, methylcyclohexane and decahydronaphthalene Solvents; chlorinated hydrocarbons such as chlorobenzene, dichlorobenzene, trichlorobenzene, methylene chloride, chloroform, carbon tetrachloride and tetrachloroethylene; methanol, ethanol, n-propynol, iso-propanol, n-butanol, sec-butanol And alcohol solvents such as tert-butanol; ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; ester solvents such as ethyl acetate and dimethyl phthalate; dimethyl Ether, diethyl ether, di -
Examples include ether solvents such as n-amyl ether, tetrahydrofuran and dioxyanisole.

As a method of treating (a) the random polypropylene with a radical generator, for example, (a) dissolving the random polypropylene in an organic solvent, then adding a radical generator or the like to the solution, and adding the radical generator to the solution at 70 ° C., further 80 ° C. 9
At a temperature of 0 ° C. to 250 ° C., further 200 ° C., especially 190 ° C., for 0.05 hour, further 0.1 hour, further 0.5 hour
The reaction is preferably carried out for a period of time, more preferably 1 hour, especially 2 hours to 20 hours, further 15 hours, especially 10 hours.

A method of treating at least one polymer selected from (a) random polypropylene, (a) random polypropylene, (b) unsaturated carboxylic acid-modified polypropylene and (c) polyethylene resin with a radical generator, The organic solvent can be used without any particular limitation as long as it is an organic solvent that can be dissolved together with (a) the random polypropylene. Examples of the organic solvent include aromatic hydrocarbon solvents such as benzene, toluene, and xylene, and aliphatic hydrocarbon solvents such as pentane, hexane, and heptane.

Further, (a) random polypropylene,
Alternatively, as a method of treating at least one polymer selected from (a) random polypropylene, (b) unsaturated carboxylic acid-modified polypropylene and (c) polyethylene resin with a radical generator, (a) random polypropylene, unsaturated carboxylic acid, Mixer capable of heating various mixtures of acid-modified polypropylene and polyethylene resin,
Using a kneadable device such as an extruder, which can be further melt-kneaded, without solvent, or in a state containing a liquid or solvent,
(A) It can be produced by reacting a random polypropylene with a radical generator. The reaction temperature is usually equal to or higher than the melting point of the random polypropylene (a), specifically 160 ° C, further 170 ° C, particularly 180 ° C to 280 ° C.
C., more preferably 260.degree. C., especially 250.degree.
The reaction time under such temperature conditions is usually 0.1
Minutes, more preferably 0.3 minutes, especially 0.5 to 10 minutes, further 8 minutes, especially 5 minutes.

A predetermined amount of a radical generator is added to one or more polymers selected from (a) random polypropylene, (a) random polypropylene, (b) unsaturated carboxylic acid-modified polypropylene and (c) polyethylene resin. It can be produced by generating radicals while kneading with an extruder. Of course, it is also possible to make them uniform at the same time without taking two steps.

(B) As the unsaturated carboxylic acid-modified polypropylene, those obtained by grafting unsaturated carboxylic acids to polypropylene can be used.

Examples of the above polypropylene include propylene homopolymer, ethylene / propylene block copolymer, ethylene / propylene random copolymer and the like. Among them, the above-mentioned ethylene / propylene random copolymer is preferably used. The unsaturated carboxylic acid-modified polypropylene preferably has an ethylene content of 1% by weight, more preferably 3% by weight, particularly preferably 5% to 20% by weight, more preferably 15% by weight, particularly preferably 10% by weight. (160 ° C.) 5,000 centipoise, more preferably 10,000 centipoise, particularly preferably 15,000 centipoise.

In the above polypropylene, when the ethylene content is smaller than the above range, the film elongation and the impact resistance are liable to decrease, and the MFR during the modification with the unsaturated carboxylic acid is liable to become remarkable. On the other hand, when the ethylene content is larger than the above range, mechanical strength and heat resistance tend to decrease.

When the viscosity of the above polypropylene is larger than the above range, it becomes difficult to obtain a good appearance in powder molding. On the other hand, if the viscosity is smaller than the above range, sagging of the coating is likely to occur.

In the polyolefin resin composition for powder coating of the present invention, a polymer obtained from (a) 100 parts by weight of random polypropylene and (d) 0.01 to 0.3 parts by weight of a radical generator per 100 parts by weight of random polypropylene The component has a higher melt flow rate at 230 ° C. than the preferred range of (a) the melt flow rate at 230 ° C. of the random polypropylene.
A random polypropylene of up to 100 g / 10 min can be used.

As the above unsaturated carboxylic acids, unsaturated dicarboxylic acids such as maleic acid, itaconic acid and citraconic acid, and anhydrides of these acids such as maleic anhydride, itaconic anhydride and citraconic anhydride are used. I can do it.

The amount of the unsaturated carboxylic acids to be grafted on the polypropylene is 0.1% by weight, more preferably 0.3% by weight.
% By weight, especially 1% to 8% by weight, more preferably 7% by weight, especially 6% by weight.

As a method of grafting the unsaturated carboxylic acids to the above polypropylene, for example, it can be produced by melt-kneading polypropylene and unsaturated dicarboxylic acids in the presence of a reaction initiator such as peroxide. The melt kneading is preferably performed at a temperature equal to or higher than the one-minute half-life temperature of the peroxide.

As the reaction initiator, an organic peroxide-based reaction initiator such as t-butyl-hydroperoxide can be used. Also, cumene dimers such as 2,3-dimethyl-2,3-diphenylbutane and derivatives thereof can be used.

(C) The polyethylene resin is mainly composed of a single catalyst system such as a metallocene catalyst, a low-density polyethylene produced by a general catalyst for producing polyethylene, and ethylene such as an ethylene-α-olefin copolymer. Resin can be used.

The low-density polyethylene has a density of 0.
87g / cm^Three0.875 g / cm^ThreeFrom 0.93
g / cm^Three0.92g / cm^Three, Especially 0.91g /
cm ^ThreeThe melt flow rate (190
C) is 1 g / 10 min, further 3 g / 10 min, especially 10 g / min.
10 to 30 g / 10 min, further 25 g / 10 min, especially
It is preferable to use a resin in a range of 20 g / 10 minutes.

The ethylene-α-olefin copolymer has a melt flow rate (190 ° C.) of 1 g / 10 minutes,
3 g / 10 min, especially 10 g / 10 min to 30 g / 1
It is preferable to use a resin in a range of 0 minute, more preferably 25 g / 10 minutes, particularly preferably 20 g / 10 minutes. As the ethylene-α-olefin copolymer, the content of α-olefin is preferably 1% by weight, more preferably 3% by weight, particularly preferably 5% to 20% by weight, further preferably 15% by weight, particularly preferably 10% by weight. As the ethylene-α-olefin copolymer, the density is 0.8
7g / cm ^3, further 0.91g from 0.875g / cm ³
/ Cm ³ , further 0.90 g / cm ³ , especially 0.895 g / cm ³
cm ³ range is preferred

In the polyolefin resin composition for powder coating of the present invention, each component is mixed by using various kneaders such as a Banbury mixer, a roll mixer, a kneader, a high-speed mixer, an extruder, preferably a twin-screw extruder. And kneaded to obtain a pellet. The polyolefin resin composition for powder coating of the present invention can be pulverized to obtain a resin powder for powder coating.

The bulk density of the resin powder for powder coating of the present invention is:
But it is not limited to, a bulk density of 0.28 g / cm ^3, further 0.30 g / cm ^3, in particular 0.31g / cm ³ ~0.
40 g / cm ³ , further 0.38 g / cm ³ , especially 0.3
A range of 6 g / cm ³ is preferred.

The particle size of the resin powder for powder coating of the present invention is not particularly limited, but the passing weight of 170 mesh is preferably 20% by weight or less, more preferably 15% by weight or less, particularly preferably 12% by weight or less. The non-passing weight is preferably 15% by weight or less, more preferably 10% by weight or less, and particularly preferably 5% by weight or less for excellent fluidity.

The polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention can be suitably used for a powder molding method. As a powder molding method, a rotational molding method, a fluid immersion method, a probe back method, a fusion coating method and the like are preferable.

The polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention can be coated or coated on a surface such as a metal surface by a powder molding method to obtain a molded product.

The polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention can be prepared by a powder molding method into tanks for transporting and storing liquids, gases and solids such as chemicals and drinking water, Baskets for dishwashers, baskets for washing, etc., playground equipment such as chairs, slides, carts, lorry containers, containers such as tool boxes, boxes, flower stands, appreciation ponds, household garbage, etc. Can be manufactured.

The polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention can be used in the fields of chemicals, seawater, water and sewage, and gas pipelines for imparting an anticorrosion function to steel pipes by a powder molding method. It can be suitably used for powdered polyethylene-lined steel pipes that can be widely used.

The polyolefin resin composition for powder coating of the present invention, the resin powder for powder coating, and the molded product obtained from the composition and the powder are, in addition to the above-mentioned composition, an antioxidant, titanium oxide and carbon. Coloring agents such as pigments and dyes such as black, fillers such as talc and mica, various additives such as ultraviolet absorbers and lubricants are added to the polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention. It can be added and used within a range that does not impair the properties of the body and these molded products.

The colorability of the film or sheet obtained from the polyolefin resin composition for powder coating and the resin powder for powder coating of the present invention and the molded product obtained by a method such as the powder molding method is 80 ° C. The color difference (ΔE) after immersion for 1 hour is less than 8, further 7.5 or less, further 7 or less, further 5 or less,
Particularly, 3 or less is preferable, and the color difference (Δ
E) is 10 or less, further 9 or less, further 8 or less, especially 7
The following is preferable, and the color difference (ΔE) after immersion for 24 hours at 80 ° C.
Is preferably 10 or less, more preferably 9 or less, and particularly preferably 8 or less.

[0040]

EXAMPLES The present invention will be described more specifically below with reference to examples. The present invention is not limited to only these examples.

The characteristic values of the resin powder for powder coating were measured as follows. (1) Melt flow rate (MFR): JIS K-7
210 (230 ° C., 21.18 N load).

(2) Surface hardness (Shore D hardness): JI
It measured according to JIS K-7215 using the sheet of thickness 4mm created based on SK-6921-2.

(3) Vicat softening point: For the purpose of evaluating the heat resistance of the coating film, it was evaluated according to the Vicat softening point measurement method of JIS K-7206.

(4) Tensile strength and elongation: For the purpose of evaluating the flexibility of the stretched film, a 1 mm thick sheet prepared according to JIS K-6921-2 was used.
The evaluation was performed in accordance with 7113.

[Method of coating (fluid immersion method) and evaluation] A resin powder for powder coating was put into a fluid immersion tank whose bottom face was partitioned by a filter cloth, and air was blown in to form a fluidized bed of powder. . Among them, 50 × 150 × heated to a predetermined temperature
2.3mm thick polished steel plate (SS41) and 3φ × 20
A 0 mm wire was immersed and taken out after a predetermined time. The coated (painted) polished steel sheet was heated again to smooth the coating. Using this coated polished steel sheet and wire, adhesion, coloring resistance, heat resistance, heat cycle properties, wear resistance,
The adhesion and the corrosion resistance were evaluated. The coating thickness is 300-5
The range is 50 μm.

(1) Adhesion: A wire of 3 mm × 200 mm was heated in an oven set at 400 ° C. for 2 minutes and 30 seconds, immersed in a fluid for 5 seconds, and then immediately heated at 200 ° C.
Heating was performed in a bun for 1 minute to form a coating. This coated wire rod is placed in a 20 ° C atmosphere at a radius of curvature of 10 mm and an angle of 90 °.
And the surface of the film was observed. The results are shown in Table 5. The number of measurements was 3. ：: no cracks or peeling on the surface; ×: cracks or peeling on the surface. (2) Coloring resistance: A polished steel plate having a thickness of 50 × 150 × 2.3 mm was heated in an oven set at 400 ° C. for 5 minutes, then immersed in a fluid for 6 seconds, and then immediately heated at 200 ° C.
Heating was performed in a bun for 1 minute to form a coating. This coated steel plate was added to retort curry and soy sauce heated to 80 ° C.
Soaked for ~ 24 hours. Color difference before and after immersion (Δ
E) was measured, and the results are shown in Table 3.

(3) Heat resistance: 50 × 150 × 2.3 mm
Polish a thick polished steel plate in an oven set at 400 ° C for 5 minutes.
After heating for 5 minutes, the sample was fluid-immersed for 6 seconds, and then immediately
Heating was carried out for 1 minute in an oven at ℃ to form a coating. The coated steel sheet was heated in an oven at a temperature of 100 ° C. for 1 hour. Visually observe blisters and peeling of the coating after heating,
The color difference (ΔE) and the discoloration of the gloss retention were evaluated, and the results are shown in Table 5. ：: No cracking or peeling on the surface and ΔE ≦ 3.
0: Gloss retention of 70% or more; ×: Cracks are observed on the surface, peeling is observed, or ΔE> 3.0 or gloss retention is less than 70%. Here, ΔE is a color difference,
It is a value that quantitatively represents the difference in color due to color vision. The color difference is
It was measured according to JIS K7105.

(Equation 1)

(Equation 2)

(4) Heat cycle property: 50 × 150 ×
2.3mm thick polished steel sheet was heated at 400 ° C.
After heating in an oven for 5 minutes, it was fluid-immersed for 6 seconds, and then immediately heated in an oven at 200 ° C. for 1 minute to form a coating. The coated steel sheet was immersed in ice water at 0 ° C. for 5 minutes.
50 cycles were performed with one cycle of immersion in hot water of 55 ° C. for 55 minutes. The blisters and peeling of the coating after the treatment were visually observed, and the results are shown in Table 5. ：: no cracks or peeling on the surface; ×: cracks or peeling on the surface.

(5) Abrasion resistance: A wire of 3 mm × 200 mm was heated in an oven set at 400 ° C. for 2 minutes and 30 seconds, immersed in a fluid for 5 seconds, and then immediately heated at 200 ° C.
Heating was performed in a bun for 1 minute to form a coating. Using this coated wire, JIS C300 which is a standard related to cable
3 (test method for enameled copper wire and enameled aluminum wire), using a 1 mmφ piano wire, load: 1500 g,
The amount of wear (mg) of the coating was measured by reciprocating abrasion 1000 times and 2000 times, and the results are shown in Table 4.

(6) Adhesion (peel strength, peel state): 5
0x150x2.3mm thick polished steel plate at 200 ° C
After heating in an oven set at 225 ° C., 250 ° C., 275 ° C. and 300 ° C. for 5 minutes, then immersion flowing for 10 seconds, and then immediately heating in an oven at 200 ° C. for 1 minute,
A coating was provided. After making a cut to reach the substrate surface in the coating, the peel strength at the time of peeling at a rate of 50 mm / min at an angle of 90 degrees was measured, and the peeling state at this time was visually observed. Shown in

(7) Corrosion resistance: 50 × 150 × 2.3 mm
Polish a thick polished steel plate in an oven set at 400 ° C for 5 minutes.
After heating for 5 minutes, the sample was fluid-immersed for 6 seconds, and then immediately
Heating was carried out for 1 minute in an oven at ℃ to form a coating. Using this coated steel sheet, salt spray treatment was performed for 360 hours in accordance with JIS Z2371, and blistering and peeling of the coating film were visually observed. The results are shown in Table 5. ：: no cracks or peeling on the surface; ×: cracks or peeling on the surface.

[Example 1] F327P (random propylene-ethylene-butene-1 copolymer, MFR (230
C): 8.9 g / 10 min) 100 parts by weight, UX10 manufactured by Sanyo Chemical Co., Ltd. as an unsaturated carboxylic acid-modified polypropylene.
01 (random polypropylene, maleic acid conversion rate:
4.5%) 12.5 parts by weight, Tuffmer A20090 manufactured by Mitsui Chemicals, Inc. as polyethylene resin (ethylene-α-olefin copolymer, MFR (190 ° C.): 18 g / 10
Min, density: 0.89 g / cm ³ ) 11.8 parts by weight and as a radical generator manufactured by Kayaku Akzo (Parcadox 1)
4) After blending 0.07 parts by weight with 6 parts by weight of a white pigment (titanium oxide), the mixture is kneaded with a twin screw extruder at a temperature of 250 ° C., and the melt flow rate at 230 ° C. is 40 g / 10.
Min, density 0.930 g / cm ³ , crystallization temperature 110
° C composition was obtained in the form of pellets. The softening temperature, surface hardness, tensile strength and elongation of this composition were measured.
Shown in

[Example 2] Production of powder The composition obtained in Example 1 was freeze-pulverized at a pulverization temperature of -80 ° C, and had a bulk density of 0.33 g / cm ³ and a non-passing weight of 60 mesh of 3%. As a result, a powder having a 170 mesh passing weight of 9% was obtained. This powder was coated (painted) on a polished steel plate having a thickness of 50 × 150 × 2.3 mm and a wire having a diameter of 3φ × 200 mm by a fluid immersion method, and various evaluations were made. The results are shown in Tables 2 to 5.

Reference Example 1 Nylon powder was mixed with 50 × 15
Tables 2 to 5 show the results of coating on a polished steel plate having a thickness of 0 × 2.3 mm and a wire rod having a diameter of 3 × 200 mm and performing various evaluations.

[0055]

[Table 1]

[0056]

[Table 2]

[0057]

[Table 3]

[0058]

[Table 4]

[0059]

[Table 5]

[0060]

Industrial Applicability The present invention uses polypropylene as a base polymer and is hardly colored even when it comes into contact with a colored liquid such as a liquid colored food such as curry, ketchup, soy sauce, sauce and butter, and has mechanical strength, elongation and heat resistance. An object of the present invention is to provide a powdery resin composition, a powder, and a powder molded product and a powder coated product obtained by coating the same, which are excellent in adhesiveness, durability and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 123/26 C09D 123/26 151/06 151/06 // (C08L 23/12 (C08L 23/12 23 : 26 23:26 23:06) 23:06) F-term (reference) 4F071 AA15 AA20 AA88 AE03 AH04 AH19 BA09 BB13 BC02 4J002 BB033 BB082 BB121 BB212 EK036 EK046 EK056 EK066 EQ016 GH00 4J038 CB022 CB081 CB022 CB081 CB022 CB081 MA14 NA03 NA05 NA11 NA12 NA14 PA02

Claims (4)

[Claims] (1) 100 parts by weight of a random polypropylene, (b) an unsaturated carboxylic acid-modified polypropylene 5
A polyolefin resin composition for powder coating obtained from 20 parts by weight, (c) 5 to 20 parts by weight of a polyethylene resin, and (d) 0.01 to 0.3 parts by weight of a radical generator per 100 parts by weight of random polypropylene. 2. A polyolefin resin composition 2 for powder coating.
The melt flow rate at 30 ° C. is 20 to 70 g / 10
The polyolefin resin composition for powder coating according to claim 1, wherein 3. A resin powder for powder coating, comprising the polyolefin resin composition for powder coating according to claim 1. 4. A powder molded article coated with the polyolefin resin composition for powder coating according to claim 1 and / or the resin powder for powder coating according to claim 3.